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Diodes Incorporated AP65450SP | Demoboard AP65450SP-EVM
4A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER
Overview
| Topology | Buck Converter |
| Input voltage | 12 V |
| Output 1 | 1.05 V / 4 A |
| IC revision | 2.0 |
Description
The AP65450 is an adaptive constant on-time mode synchronous buck converter providing high efficiency, excellent transient response and high DC output accuracy for low-voltage regulation in digital TV and monitor.
The constant-on-time control scheme handles wide input/output voltage ratios and provides low external component count. The internal proprietary circuit enables the device to adopt both low equivalent series resistance (ESR) output capacitors, such as SP-CAP or POSCAP and ultra-low ESR ceramic capacitors.
The adaptive on-time control supports seamless transition between continuous conduction mode (CCM) at higher load conditions and discontinuous conduction mode (DCM) at lighter load conditions. DCM allows AP65450 to maintain high efficiency at light load conditions. The AP65450 also features programmable soft-start, UVLO, OTP and OCP to protect the circuit.
This IC is available in SO-8EP package
Features
- Fixed Frequency Emulated Constant On-time Control
- Good Stability Independent of the Output Capacitor ESR
- Fast Load Transient Response
- Synchronous Rectification: 65mΩ Internal High-side Switch and
- 36mΩ Internal Low-side Switch
- Wide Input Voltage Range: 4.5V to 18V
- Output Voltage Range: 0.76V to 6V
- 4A Continuous Output Current
- 650kHz Switching Frequency
- Built-in Over Current Limit
- Built-in Thermal Shutdown Protection
- Programmable Soft-start
- Pre-biased Start-up
- Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
- Halogen and Antimony Free. “Green” Device (Note 3)
Remarks:A 1μH to 3.3μH inductor with a DC current rating of at least 25% percent higher than the maximum load current is recommended for mostapplications.
Table 2 Recommended Component SelectionRefer page no.10
Typical applications
- Consumer Electronics
- Set-Top Boxes
- Gaming Consoles
- Home Audio
- Green Electronics
- Flat Screen TV Sets and Monitors
- Distributed power systems
- Network Systems
- FPGA, DSP and ASIC Supplies
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012207098 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | 100 nF | ±10% | 50 | 0805 | -55 °C up to +125 °C | 2.5 | 5 GΩ | X7R Class II | 2 | 1.25 | 0.8 | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | ||
| 885012207051 | SPEC | 7 files | WCAP-CSGP MLCCs 16 V(DC) | 1 µF | ±10% | 16 | 0805 | -55 °C up to +125 °C | 5 | 0.5 GΩ | X7R Class II | 2 | 1.25 | 1.25 | 0.5 | 7" Tape & Reel | – | – | – | – | – | – | – | ||
| 885012209028 | SPEC | 8 files | WCAP-CSGP MLCCs 25 V(DC) | 10 µF | ±10% | 25 | 1210 | -55 °C up to +125 °C | 5 | 0.01 GΩ | X7R Class II | 3.2 | 2.5 | 2 | 0.3 | 7" Tape & Reel | – | – | – | – | – | – | – | ||
 | 744311150 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | – | – | – | 7040 | -40 °C up to +150 °C | – | – | – | 7 | 6.9 | 3.8 | – | – | 1.5 | 13.8 | 4.5 | 14 | 6.6 | 72 | Superflux |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012207098 | SPEC | |
| 885012207051 | SPEC | |
| 885012209028 | SPEC | |
| 744311150 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Samples |
|---|